Annealing pot



i to which it appertains to make hetented Sept. 29, 1925.

UNITED STATES Parent PAUL BREDDIN, 01E COLOGNE, GERMANY, ASSIGNOR TO THEODOR LALMI'NE, OE COLOGNE-MUEHLHEIM, ,GERMANY.

' 'ANNEALING POT.

Application filed March 25, '1925. Serial No. 18,203.

To (117. whom it may; concern:

Be it known that 1, PAUL 'Bnnnnrx, a citi- Zen of Germany, residing atCologne, Bio. 12 Hohepforte, State of Prussia, .Germany, have invented certain new and useful improvements in Annealing Pots; and I do hereby declare the following to be a full, clear, and exact description of the inventio such as will enable'others skilled in the art and use the same.

This invention relates to annealing pots of the kind made up of a cylindrical wrought iron body to which is welded an outwardly enlarged rim ring of strong sectioned iron, which contains the prei Joly plane packingsurfaces on w iich one 01 two closure covers bear by means of theiredges and on the free-edge of which are provided the suspension lugs or eyes serving to transport the annealing pot by means of a crane or hoisting mechanism.

In the wrought iron annealing pots of this type hitherto known, the cylindrical body of the pot was constructed from a fiat rectangular outer sheet metal plate and a round bottom piece in such a manner that this outer sheet metal plate was drawn to gether to form a cylindrical body and enlarged into a cylinder open at both ends completed by a longitudinal welded seam, to one end of which the bottom plate and to the other end the cover rim ring were con nected by welding.

The carrying out of the welding operation particularly leads to ditliculties at the places at which the longitudinal welded seam of the cylinder meets the two annular welded seams of the bottom and cover rim and even when the welding of seams is carried out carefully at these points it is frequently impossible to avoid the formation of pores in the interior of the latter which after the outer surface of the pot has been burnt away to some extent, as is unavoidable with such annealing pots, open out and lead to leakages which have an undesirable effect on the constitution of the material which is being annealed.

In order to avoid this the cylindrical body of the annealing pot together with the bottom is produced, according to the invention,

without a seam from a single flat sheet metal plate by a pressing or drawing process carried out in the hot condition, so that of the three welded seams of the annealing pots above referred to only the ring welding seam remains for connecting the cover ring to the cylindrical body. The nrodnrf'on of such annealing pets is consice bly snnplificd in this manner particularly by the omission of the said rectang point of the annular welded seams with the longitudinal seam and the lite of the product is increased. I

In the drawing the two parts of such an annealing pot are illustrated in vertical axial section before being connected together.

The cylindrical body of rotation l of the lower main portion of the pot is produced with the bottom 2 in one piece from a at metal plate by pressing or drawing in the hot-condition. The cover rim body 8, pref erably consists of a sectioned iron ring rolled without scam in the manner of a wheel tyre and is provided with a sleeve like enlargement for the formation of one or more packing surfaces 4-, 5. The lower narrower portion of the rim ring corresponds in diameter and thickness with the upper edge of the cylindrical body 1. The two abutting edges are connected together as firmly and as tightly as possible, for completing the article, in the known manner by a welded seam, extending all around, preferably produced by water gas or coal fire.

A peculiar result of the drawing or pressing process used for the production of the cylindrical pot body is that a more or less considerable increase in the thickness of the cylindrical body towards the free edge thereof is produced Whilst the thickness of 'the bottom remains unchanged and the adjacent cylindrical parts will have a more or less reduced thickness. This leads to particular advantages in the finished product as the upper part of the annealing pot and particularly the cylindrical wall are exposed to the burning to a greater extent than the parts near the bottom, which as has been found by experience are less exposed to the gases passing around the pot in the furnace than the upper wall parts of the pot. This is also advantageous in practice as the bottom parts take up the heat by conduction and radiation from the highly heated brick-work more effectively than the upper parts of the pot, to which lar connecting the heat is conducted by the firing gases themselves; with the same length of life this method of production of the annealing pots also leads to a considerable reduction in weight or with the same weight suspension eyes 7 may be provided either by welding or in any other known manner. The cover rim ring may be made of the re quired shape by using a casting process instead of a rolling process.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. As a new article of manufacture, a wrought iron annealing pot, comprising a drawn or pressed cup-shaped body formed of a substantially cylindrical wall and integral bottom, and a cover rim annulus welded to the upper edge of said cup wall.

2. As a new article of manufacture, a

wrou ht iron annealin ot com risin a hot drawn or pressed cup-shaped body formed of a substantially cylindrical wall and an integrally connected bottom, and a profiled seamless cover rim annulus lapiii) Welded to the upper edge of said cup wall.

3. As a new article of manufacture, a

wrought iron annealing pot comprising a substantially cup-shaped body having a oylindrical wall with its upper edge beveled outwardly and downwardly, said body being pressed from a sheet of material and said wall attenuating downwardly immediately beneath the beveled upper edge, and a shaped cover rim ring welded to the said upper edge, said ring having its lower edge beveled downwardly and outwardly to seat 7 011 the upper edge of said wall, said beveled edges being welded together.

4. The described method of manufacturing wrought iron annealing pots, which comprises drawing or pressing a seamless cup-shaped body from a sheet of material, seamlessly shaping a cover rim annulus, and then welding the two comp-lemental edges of cup and annulus together.

5. The method of manufacturing wrought iron annealing pots, which comprises hot drawing or pressing a seamless cup-shaped body from a sheet of material, beveling the top edge thereof, seamlessly shaping a cover rim annulus, beveling the lower edge thereof, and finally lap-welding the two complemental beveled edges of cup and annulus.

In testimony whereof I have signed my name to this specification.

PAUL BREDDIN. 

